Maintain the current row position of a table after refresh.

Question

Hi,
I use a poll to refresh tables continuously. when a table is refreshed, the current referring row is reset.
To maintain the current row position after a refresh I use the following poll method.
public void refreshTableT1(PollEvent pollEvent) {
FacesContext fctx = FacesContext.getCurrentInstance();
ValueBinding dcb = fctx.getApplication().createValueBinding("#{bindings}");
DCBindingContainer bindings1 = (DCBindingContainer) dcb.getValue(fctx);
DCIteratorBinding dciter = bindings1.findIteratorBinding("<VOIterator>");
if(dciter!=null){
if(dciter.getCurrentRow()!=null){   
Key current_row_key = dciter.getCurrentRow().getKey();
dciter.executeQuery();
if(current_row_key!=null){
try{
dciter.setCurrentRowWithKey(current_row_key.toStringFormat(true));
}catch(Exception ex) {
System.out.println("Exception in current_row_key");
}This works for normal tables well. But when I use it to master-detail tables (pair of tables) it does not.
At the master-detail tables, before the first data fetch, it works well. if we go below the first data fetch, it sets the current row into another position.
how can I overcome this...??
Thanks,
Dinuka.

Answer 1

Hi Mr.Frank,
I have an association in two VOs.
for example: There are 2 tables called Emp and Dept. Every Department has Employees. so there is an association (both tables have a common column). Master table is the Dept table. when you click on one record of the Dept table Detail table will show the details of the employees belongs to that selected department. That's what I referred as master-detail tables. first one is master table; second one is detail table.
When the web page loads all the table data is not fetched from the db (it will depend on the fetch size). when we scroll down the table data fetch happens again and again.
think my data fetch size is 25 rows per time.
Suppose we use mine poll method and think I have clicked on the 20 ^th^ row of table1(master table). then the table2 will display details belongs to selected department. that is OK even after refresh. that works well.
when I go to 30 ^th^ row data fetch will happen (my fetch size = 25)
when I click on the 30 ^th^ row of the table1(master table), table2 will display details belongs to selected department. but after the poll method is called the selected row at the table1 disappears and is set to another position. now the 30 ^th^ row is not in the 30 ^th^ position. but it is the selected row and table2 displays correct details.
I think you have got the problem now. :D
Thanks a lot.
Dinuka.